21798455467 has 4 divisors (see below), whose sum is σ = 22097064520. Its totient is φ = 21499846416.

The previous prime is 21798455453. The next prime is 21798455477. The reversal of 21798455467 is 76455489712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21798455467 - 2¹¹ = 21798453419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21798455407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149304417 + ... + 149304562.

It is an arithmetic number, because the mean of its divisors is an integer number (5524266130).

Almost surely, 2^21798455467 is an apocalyptic number.

21798455467 is a deficient number, since it is larger than the sum of its proper divisors (298609053).

21798455467 is an equidigital number, since it uses as much as digits as its factorization.

21798455467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298609052.

The product of its digits is 16934400, while the sum is 58.

The spelling of 21798455467 in words is "twenty-one billion, seven hundred ninety-eight million, four hundred fifty-five thousand, four hundred sixty-seven".